Apr 9, 2004 #1 B Brisc0 Aquarium Advice FINatic Joined Nov 12, 2003 Messages 861 Location Springfield, MO I have no idea... it seems to grow and is somewhat capable of moving about the tank.
Apr 9, 2004 #2 reefrunner69 Aquarium Advice Addict Joined May 16, 2002 Messages 1,663 Location Cedar Key, FL looks like some type of cowrie or shielded snail maybe a limpet.